This kipuka formed during the Pu`u `O`o-Kupaianaha eruption on the east rift zone of Kilauea Volcano, Hawai`i.
is a Hawaiian
term for an "island" of land completely surrounded by one or more younger lava
flows. A kipuka forms when lava encircles a hill or a slight rise in the ground as it moves downslope or across relatively flat ground. Because they are surrounded by more recent flows, kipukas are often covered with mature vegetation.
USGS Photo Glossary